IBM previous year placement papers

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Previous year placement papers of IBM






IBB Placement Papers 01

1. The C language terminator is
(a) semicolon
(b) colon
(c) period
(d) exclamation mark

2. What is false about the following -- A compound statement is
(a) A set of simple statments
(b) Demarcated on either side by curly brackets
(c) Can be used in place of simple statement
(d) A C function is not a compound statement.

3. What is true about the following C Functions
(a) Need not return any value
(b) Should always return an integer
(c) Should always return a float
(d) Should always return more than one value

4. Main must be written as
(a) The first function in the program
(b) Second function in the program
(c) Last function in the program
(d) Any where in the program

5. Which of the following about automatic variables within a function is correct ?
(a) Its type must be declared before using the variable
(b) Tthey are local
(c) They are not initialised to zero
(d) They are global

6. Write one statement equivalent to the following two statements
x=sqr(a);
return(x);
Choose from one of the alternatives
(a) return(sqr(a));
(b) printf("sqr(a)");
(c) return(a*a*a);
(d) printf("%d",sqr(a));


7. Which of the following about the C comments is incorrect ?
(a) Ccommentscan go over multiple lines
(b) Comments can start any where in the line
(c) A line can contain comments with out any language statements
(d) Comments can occur within comments


8. What is the value of y in the following code?
x=7;
y=0;
if(x=6) y=7;
else y=1;
(a) 7
(b) 0
(c) 1
(d) 6


9. Read the function conv() given below
conv(int t){
int u;
u=5/9 * (t-32);
return(u);
}
What is returned
(a) 15
(b) 0
(c) 16.1
(d) 29

10. Which of the following represents true statement either x is in the range of 10 and 50 or y is zero
(a) x >= 10 && x <= 50 || y = = 0
(b) x<50
(c) y!=10 && x>=50
(d) None of these

11. Which of the following is not an infinite loop ?
(a) while(1)\{ ....}
(b) for(;
{
...
}

(c) x=0;
do{
/*x unaltered within the loop*/
.....}
while(x = = 0);

(d) # define TRUE 0
...
while(TRUE){
....}

12. What does the following function print?
func(int i)
{ if(i%2)return 0;
else return 1;}
main()
{
int =3;
i=func(i);
i=func(i);
printf("%d",i);
}
(a) 3
(b) 1
(c) 0
(d) 2

13. How does the C compiler interpret the following two statements
p=p+x;
q=q+y;
(a) p=p+x;
q=q+y
(b)p=p+xq=q+y
(c)p=p+xq;
q=q+y
(d)p=p+x/q=q+y

For questions 14,15,16,17 use the following alternatives
a.int
b.char
c.string
d.float

14. '9'

15. "1 e 02"

16. 10e05

17. 15




18. Read the folllowing code

# define MAX 100
# define MIN 100
....
....
if(x>MAX)
x=1;
else if(xx=-1;
x=50;
if the initial value of x=200,what is the value after executing this code?
(a) 200
(b) 1
(c) -1
(d) 50

19. A memory of 20 bytes is allocated to a string declared as char *s
then the following two statements are executed:
s="Entrance"
l=strlen(s);
what is the value of l ?
(a)20
(b)8
(c)9
(d)21

20. Given the piece of code
int a[50];
int *pa;
pa=a;

To access the 6th element of the array which of the following is incorrect?
(a) *(a+5)
(b) a[5]
(c) pa[5]
(d) *(*pa + 5}

21. Consider the following structure:
struct num nam{
int no;
char name[25];
}
struct num nam n1[]={{12,"Fred"},{15,"Martin"},{8,"Peter"},{11,Nicholas"}};
.....
.....
printf("%d%d",n1[2],no,(*(n1 + 2),no) + 1);

What does the above statement print?
(a) 8,9
(b) 9,9
(c) 8,8
(d) 8,unpredictable value


22. Identify the in correct expression
(a) a=b=3=4;
(b) a=b=c=d=0;
(c)float a=int b=3.5;
(d)int a; float b; a=b=3.5;


23. Regarding the scope of the varibles;identify the incorrect statement:
(a)automatic variables are automatically initialised to 0
(b)static variables are are automatically initialised to 0
(c)the address of a register variable is not accessiable
(d)static variables cannot be initialised with any expression

24. cond 1?cond 2?cond 3?:exp 1:exp 2:exp 3:exp 4;
is equivalent to which of the following?
(a)if cond 1
exp 1;
else if cond 2
exp 2;
else if cond 3
exp 3;
else exp 4;

(b) if cond 1
if cond 2
if cond 3
exp 1;
else exp 2;
else exp 3;
else exp 4;

(c) if cond 1 && cond 2 && cond 3
exp 1 |exp 2|exp 3|exp 4;

(d) if cond 3
exp 1;
else if cond 2 exp 2;
else if cond 3 exp 3;
else exp 4;

25. The operator for exponencation is
(a) **
(b) ^
(c) %
(d) not available

26. Which of the following is invalid
(a) a+=b
(b) a*=b
(c) a>>=b
(d) a**=b

27. What is y value of the code if input x=10
y=5;
if (x==10)
else if(x==9)
else y=8;
(a)9
(b)8
(c)6
(d)7

28. What does the following code do?
fn(int n,int p,int r){
static int a=p;
switch(n){
case 4:a+=a*r;
case 3:a+=a*r;
case 2:a+=a*r;
case 1:a+=a*r;}}
(a)computes simple interest for one year
(b)computes amount on compound interest for 1 to 4 years
(c)computes simple interest for four year
(d)computes compound interst for 1 year

29. a=0;
while(a<5)
printf("%d\\n",a++);
How many times does the loop occurs?
(a)infinite
(b)5
(c)4
(d)6


30. How many times does the loop iterated ?
for (i=0;i=10;i+=2)
printf("Hi\\n");
(a)10
(b) 2
(c) 5
(d) None of these

31. What is incorrect among the following
A recursive function
(a) calls itself
(b) is equivalent to a loop
(c) has a termination condition
(d) does not have a return value at all

32. Which of the following go out of the loop if expn 2 becoming false

(a) while(expn 1)\{...if(expn 2)continue;}
(b) while(!expn 1)\{if(expn 2)continue;...}
(c) do{..if(expn 1)continue;..}while(expn 2);
(d) while(!expn 2)\{if(expn 1)continue;..\}

33. Consider the following program
main()
{unsigned int i=10;
while(i>=0){
printf("%u",i)
i--;}
}

How many times the loop will get executed
(a)10
(b)9
(c)11
(d)infinite

34.Pick out the add one out
(a) malloc()
(b) calloc()
(c) free()
(d) realloc()




35.Consider the following program
main(){
int a[5]={1,3,6,7,0};
int *b;
b=&a[2];
}
The value of b[-1] is
(a) 1
(b) 3
(c) -6
(d) none


36. # define prod(a,b)=a*b
main(){
int x=2;
int y=3;
printf("%d",prod(x+2,y-10)); }
the output of the program is
(a) 8
(b) 6
(c) 7
(d) None


37.Consider the following program segment
int n,sum=1;
switch(n){
case 2:sum=sum+2;
case 3:sum*=2;
break;
default:sum=0;}
If n=2, what is the value of sum
(a) 0
(b) 6
(c) 3
(d) None of these


38. Identify the incorrect one
1.if(c=1)
2.if(c!=3)
3.if(a4.if(c==1)
(a) 1 only
(b) 1&3
(c) 3 only
(d) All of the above

39. The format specified for hexa decimal is
(a) %d
(b) %o
(c) %x
(d) %u

40. Find the output of the following program
main(){
int x=5, *p;
p=&x
printf("%d",++*p);
}
(a) 5
(b) 6
(c) 0
(d) none of these

IBM Placement Papers 02:

1. Find the probability of getting a number with 7 between 100 and 999 (both inclusive).

2. There are 10 items in a box, out of which 3 are defective. 2 balls are taken one after the other. What is the probability that both of them are defective?

3. Context free grammar is accepted by
a) finite automata
b) push down automata
c) two way bounded automata
d) both b and c

4. Which is not a memory management scheme?
a) buddy system
b) swapping
c) monitors
d) paging
Ans : c

5. Simplify the Karnaugh map given below and derive its expression in SOP form
- 1 1 -
1 - - 1
1 - - 1
- 1 1 -

6. Question on NAND gates implementation.

7. Definition of Context Sensitive Grammar

8. An identifier can start with a letter followed by any number of letter or digits .

9. With the following configuration:
8MB total memory, 256kb cache , 4kb is block size. Using direct mapping, how many different physical memory blocks can be mapped on to the cache.
(a) 64 (b) 256 (c) 128

10. CSMA/CD is used in
a) Token ring
b) FDDI
c) Ethernet

11. In TCP/IP header, checksum contains
a) sum of all the words
b) ones complement of the data
c) ones complement of the sum of all the words
d) ones complement of the sum in ones complement

12. What is the maximum number of acknowledgements for a 4 bit sequence number in a sliding window protocol.

13. Which is a good way of representing variables in recursion
a) local variables
b) static variables
c) global variables

14. Given the following c program
func()
{
static int i = 10;
printf("%d",i);
i++;
}
What is the value of i if the function is called twice ?

15. Given the following c program
func(int *i, int*j)
{*i=*i * *i;
*j=*j* *j;
}

main()
{ int i = 5, j = 2;
func(&i,&j);
printf("%d %d", i, j);}

What is the output?

16. Given page table, page size and offset find the corresponding physical address ?

17. In a memory chip 4k size and 16bit words are to be stored. No of address and data lines required is:

18. Identify in which pass of the 2 pass compiler are the following compiled
1) literals
2) address resolution
3) listing

19. Object code does not require
a) relocation bits
b) external names and place where they are located
c) absolute adress
d) all the object codes

20. ARP is in reference to
a) MAC to IP
b) IP to MAC


21. Question on Balanced tree -
A balanced tree is given and a node is added at the leaf. Find the no of unbalanced nodes?

22. What is the order of Hashing time:
a) 0(1)
b) 0(n2)

23. Given that:
s -> s + s ; s -> s * s ; s -> a
Find the no of parse trees for a+a*a+a
a) 4
b) 5
c) 6
d) 7

24. Order of deleting a node from a linked list. (pointer is to an arbitrary node)
a)0(1)
b)0(n)


25. A chocolate of size nXn is given and is to be made into pices of size 1x1. At a time both horizontal and a vertical cut is done. Find the order of complexity
a) O(n2)
b) O(nlogn)
c) O(logn)

26. A directed graph is represented by adjacency list. To find the complexity of in degree of the node. e - edge n- vertices

27) No of leaf nodes given. find the no of nodes with degree 2.

28) AX = B. A is mXn and B is mX1
a) there is a unique solution if rank of A is same as rank of augumented matrix [A b]
b) there are multiple solutions

29. LXI sp,2099h
LXI b, 2012h
PUSH b


30. A and B are sets.
A's cardinality is m and B's is n where m < n .How many one to one mappings can be obtained.
a) n ^ m
b) npm
c) mpn
d) mcn

31. In scheduling algorithms which are logically executed but suspended
a) preemptive
b) SJF
c) non preemptive
d) all the above

32. I/O redirection is
a) copying programs files through a pipe
b) input files are created
c) input file taken from existing ones
d) none

33. Symmetric multiprocessing can be done in
a) snoopy protocols
b) cache coherence

34. In the dining philosophers problems to avoid dead lock
a) 1 person will take left one and all other will take right one
b) adjacent persons should not eat concurrently

35. In the process state cycle, which is the correct order
a) timeout: ready -> running
b) blocked: ready -> running

36. For converting infix expression to postfix what do we require
a) operand stack
b) operator stack

37. 0 is represented as both and negative and positive in
a) ones complement
b) twos complement
c) two's complement has extra negative number

38. What is the difference between c and c++?
a) In c++ we can define variables in the middle
b) dynamic scooping


39. Which of the following is correct
a) Synchronous transmission needs more bandwidth than Asynchronous.
b) Inasychronous transmission , the time is associated with data itself.....

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